Multiphase permanent magnet motor speed regulating system based on phase switching and speed regulating method thereof

Abstract

The invention discloses a multiphase permanent magnet motor speed regulating system based on phase switching and a speed regulating method thereof. The multiphase permanent magnet motor speed regulating system comprises a first inverter, a second inverter, a change-over circuit, a first circuit breaker, a second circuit breaker and a multiphase permanent magnet motor. The multiphase permanent magnet motor is of a structure including two three-phase windings. The three-phase output end of the first inverter is respectively connected with the three-phase positive end of the first winding of the motor, the three-phase negative end of the first winding is respectively connected with the three-phase positive end of the second winding of the motor, and the three-phase negative end of the second winding is respectively connected with the three-phase output end of the second inverter. The first inverter and the second inverter are respectively powered on by two independent direct current power supplies, the first circuit breaker and the second circuit breaker are respectively arranged at the low potential ends of direct current buses of the first inverter and the second inverter. The change-over circuit is used for adjusting connecting modes of the first winding and the second winding so as to adjust counter potential of the motor. The multiphase permanent magnet motor speed regulating system can widen a speed regulating range and improve speed regulating flexibility of the permanent magnet motor and the error-tolerant rate.

Description

technical field [0001] The invention belongs to the technical field of motors, and more specifically relates to a multi-phase permanent magnet motor speed control system based on phase switching and a speed control method thereof. Background technique [0002] At present, in low-voltage, high-power, high-performance, and high-reliability applications such as ship propulsion, electric locomotives, and industrial traction, motor drive systems with high torque density and quality, high efficiency, wide speed ratio, and strong fault tolerance are the research topics of people. hotspots. [0003] Research at home and abroad shows that the permanent magnet motor system has the characteristics of high torque density and high efficiency, making it gradually become the best choice for modern industrial drive systems, especially in the electric vehicle industry. However, in electric drive systems such as electric vehicles and direct-drive CNC machine tools, the operating speed range ...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a multi-phase permanent magnet motor speed regulation system and its speed regulation method based on phase switching, the purpose of which is to improve the speed regulation range and flexible speed regulation of the permanent magnet motor The performance and the fault tolerance rate of the speed control system, thereby solving the technical problems of the permanent magnet motor with short life and poor stability caused by the irreversible demagnetization of the permanent magnet

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